Centrex

You may think of the ROLM Phone as some sort of pre-historic telecommunication contraption, but you'd be mistaken. That title goes to Centrex, a phone so advanced that it features "light-up pushbuttons to switch among lines".[1]

Lamentation for Centrex

On Fall Orgo Night, 1988, shortly after it was replaced by ROLM, CUMB sung this lamentation for the Centrex: